What are the two most populous countries in Africa, whose combined populations account for over 25% of Africa's population?
a. Nigeria and Ethiopia
b. Nigeria and the Democratic Republic of Congo
c. Kenya and Ethiopia
d. Kenya and the Democratic Republic of Congo
e. South Africa and Ethiopia
a
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____ connect(s) atoms by sharing the energy of paired electrons
a. Covalent bonds b. Hydrogen bonds c. Cohesion d. Adhesion
What is an example of a K-selected species?
A. goats B. bacteria C. whales D. flies E. frogs
The process whereby the earth's life changes over time through changes in genes of populations of organisms in succeeding generations is called ____.
A. emigration B. mutation C. natural selection D. evolution E. genetic drift
The wind-chill index takes into account the wind speed at about ____ above the ground instead of the where official readings are usually taken
a. ?10 m (33 ft) b. ?5 m (16.5 ft) c. ?100 m (330 ft) d. ?1.5 m (5 ft) e. ?15 m (50 ft)